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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 02/11/2021 08:51, Roger Pau Monné wrote: > On Mon, Nov 01, 2021 at 10:47:26AM +0000, Andrew Cooper wrote: >> Hello, >> >> On ARM, the GIC is a hard prerequisite for VMs. >> >> I can't remember what the state of RISCV is, but IIRC there is still >> some debate over how interrupts are expected to work under virt. >> >> On x86, the story is very different.  PV have no hardware assistance, >> while HVM hardware assistance depends on hardware support.  Therefore we >> want to introduce a new CDF flag so we can control the setting per >> domain, rather than globally as it is done now. >> >> This brings us to the question of what a suitable architecture name >> would be. >> >> Hardware Virtual Interrupts is a little too close to Hardware Virtual >> (Machine) Introspection, and Hardware Assisted Interrupts (mirroring >> HAP) doesn't seem great either. >> >> Thoughts / ideas / suggestions? > Is this going to cover both hardware assisted interrupt > controller and assisted interrupt delivery (ie: APIC virtualization > and posted interrupts in x86 speak) or just one of them? > > Thanks, Roger. It's not going to cover IOMMU posted interrupts, only CPU posted interrupts. Jane. --------------szIPHiIE3j04PJNBfH0WEAiA Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit
On 02/11/2021 08:51, Roger Pau Monné wrote:
On Mon, Nov 01, 2021 at 10:47:26AM +0000, Andrew Cooper wrote:

Hello,

On ARM, the GIC is a hard prerequisite for VMs.

I can't remember what the state of RISCV is, but IIRC there is still
some debate over how interrupts are expected to work under virt.

On x86, the story is very different.  PV have no hardware assistance,
while HVM hardware assistance depends on hardware support.  Therefore we
want to introduce a new CDF flag so we can control the setting per
domain, rather than globally as it is done now.

This brings us to the question of what a suitable architecture name
would be.

Hardware Virtual Interrupts is a little too close to Hardware Virtual
(Machine) Introspection, and Hardware Assisted Interrupts (mirroring
HAP) doesn't seem great either.

Thoughts / ideas / suggestions?

Is this going to cover both hardware assisted interrupt
controller and assisted interrupt delivery (ie: APIC virtualization
and posted interrupts in x86 speak) or just one of them?

Thanks, Roger.
It's not going to cover IOMMU posted interrupts, only CPU posted interrupts.


Jane.
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